Abstract: In response to the low-power requirements for psychological measurement data acquisition in handheld devices, this paper employs the SP6641 to design a highly efficient, step-up DC/DC conversion power supply circuit. The detailed design scheme and the selection of peripheral circuit components are presented, focusing on powering handheld devices using two standard alkaline batteries. This power supply circuit is characterized by its low startup voltage, ultra-low quiescent current, and high-efficiency voltage conversion for both single and dual battery-powered handheld applications.
Keywords: SP6641; power supply; voltage conversion; handheld device
1 Introduction At present, battery-powered electronic products and portable instruments are increasingly inclined toward low-voltage, low-power, and miniaturized designs, demanding advanced DC/DC converters. These converters prioritize output accuracy, conversion efficiency, and startup voltage, among other critical factors. This paper introduces the SP6641, a step-up PFM-controlled DC/DC converter with a simple structure, compact size, high efficiency, and low power consumption. Additionally, it discusses the application of this device in the power management of psychological evaluation handheld data acquisition systems.
2 SP6641 Device Overview The SP6641 is a low-power, low-voltage, step-up DC/DC converter that provides a stable DC power supply to microcontroller systems across a wide input voltage range. It boasts an exceptionally low quiescent current of 10μA, a 0.3Ω N-channel charge switch, a minimum startup voltage of 0.9V, and an adjustable inductor current limit module of either 0.33A or 1.0A. The SP6641 is available in a 5-pin SOT-23 package, with the pin configuration illustrated in Figure 1 below.
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3 Design Considerations When designing a power supply circuit using the SP6641, careful attention must be paid to several key parameters. First, the input voltage range must be selected carefully to ensure compatibility with the battery chemistry used. For instance, two alkaline batteries provide a nominal voltage of 3V, which falls within the recommended operating range of the SP6641. Second, the external components, such as inductors and capacitors, should be chosen based on their efficiency and ESR values to maximize overall system performance. Finally, the layout of the PCB plays a crucial role in minimizing losses and maintaining signal integrity.
In conclusion, the SP6641 offers a robust solution for powering handheld devices while meeting stringent low-power and low-voltage requirements. Its compact form factor and high efficiency make it ideal for modern portable electronics, ensuring reliable operation even under challenging conditions. Future work could involve exploring additional applications of this technology in diverse fields, such as medical devices and IoT sensors.
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